MPEP § 2163.04 — Burden on the Examiner with Regard to the Written Description Requirement (Annotated Rules)

§2163.04 Burden on the Examiner with Regard to the Written Description Requirement

USPTO MPEP version: BlueIron's Update: 2025-12-31

This page consolidates and annotates all enforceable requirements under MPEP § 2163.04, including statutory authority, regulatory rules, examiner guidance, and practice notes. It is provided as guidance, with links to the ground truth sources. This is information only, it is not legal advice.

Burden on the Examiner with Regard to the Written Description Requirement

This section addresses Burden on the Examiner with Regard to the Written Description Requirement. Primary authority: 35 U.S.C. 112(a) and 35 U.S.C. 112. Contains: 2 requirements and 4 other statements.

Key Rules

Topic

Rejections Not Based on Prior Art

5 rules
StatutoryInformativeAlways
[mpep-2163-04-0ce3c76f366bd4d7290cb289]
Review Basis for Written Description Rejection Before Repeating
Note:
Before repeating a rejection under 35 U.S.C. 112(a) for lack of written description, review the entire record including amendments and arguments submitted by the applicant.

Upon reply by applicant, before repeating any rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, for lack of written description, review the basis for the rejection in view of the record as a whole, including amendments, arguments, and any evidence submitted by applicant. If the whole record now demonstrates that the written description requirement is satisfied, do not repeat the rejection in the next Office action. If the record still does not demonstrate that the written description is adequate to support the claim(s), repeat the rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, fully respond to applicant’s rebuttal arguments, and properly treat any further showings submitted by applicant in the reply. When a rejection is maintained, any affidavits relevant to the 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, written description requirement, must be thoroughly analyzed and discussed in the next Office action. See In re Alton, 76 F.3d 1168, 1176, 37 USPQ2d 1578, 1584 (Fed. Cir. 1996).

Jump to MPEP SourceRejections Not Based on Prior ArtAssignee as Applicant SignatureApplicant and Assignee Filing Under AIA
StatutoryInformativeAlways
[mpep-2163-04-12f5cbaf5164c06c358aed13]
Do Not Repeat Written Description Rejection If Satisfied
Note:
If the record now shows that the written description requirement is met, do not restate the rejection in the next office action.

Upon reply by applicant, before repeating any rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, for lack of written description, review the basis for the rejection in view of the record as a whole, including amendments, arguments, and any evidence submitted by applicant. If the whole record now demonstrates that the written description requirement is satisfied, do not repeat the rejection in the next Office action. If the record still does not demonstrate that the written description is adequate to support the claim(s), repeat the rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, fully respond to applicant’s rebuttal arguments, and properly treat any further showings submitted by applicant in the reply. When a rejection is maintained, any affidavits relevant to the 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, written description requirement, must be thoroughly analyzed and discussed in the next Office action. See In re Alton, 76 F.3d 1168, 1176, 37 USPQ2d 1578, 1584 (Fed. Cir. 1996).

Jump to MPEP SourceRejections Not Based on Prior ArtRejection of ClaimsExamination Procedures
StatutoryInformativeAlways
[mpep-2163-04-9598671cecd3d9aed100559d]
Maintain Written Description Rejection If Not Satisfied
Note:
If the record still does not show adequate written description to support claims, maintain rejection and fully address applicant’s arguments.

Upon reply by applicant, before repeating any rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, for lack of written description, review the basis for the rejection in view of the record as a whole, including amendments, arguments, and any evidence submitted by applicant. If the whole record now demonstrates that the written description requirement is satisfied, do not repeat the rejection in the next Office action. If the record still does not demonstrate that the written description is adequate to support the claim(s), repeat the rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, fully respond to applicant’s rebuttal arguments, and properly treat any further showings submitted by applicant in the reply. When a rejection is maintained, any affidavits relevant to the 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, written description requirement, must be thoroughly analyzed and discussed in the next Office action. See In re Alton, 76 F.3d 1168, 1176, 37 USPQ2d 1578, 1584 (Fed. Cir. 1996).

Jump to MPEP SourceRejections Not Based on Prior ArtAssignee as Applicant SignatureApplicant and Assignee Filing Under AIA
StatutoryRequiredAlways
[mpep-2163-04-f63da42656cfd703c0060cba]
Affidavits for Written Description Must Be Analyzed
Note:
When a rejection based on the written description requirement is maintained, any affidavits submitted by the applicant must be thoroughly analyzed and discussed in the next Office action.

Upon reply by applicant, before repeating any rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, for lack of written description, review the basis for the rejection in view of the record as a whole, including amendments, arguments, and any evidence submitted by applicant. If the whole record now demonstrates that the written description requirement is satisfied, do not repeat the rejection in the next Office action. If the record still does not demonstrate that the written description is adequate to support the claim(s), repeat the rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, fully respond to applicant’s rebuttal arguments, and properly treat any further showings submitted by applicant in the reply. When a rejection is maintained, any affidavits relevant to the 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, written description requirement, must be thoroughly analyzed and discussed in the next Office action. See In re Alton, 76 F.3d 1168, 1176, 37 USPQ2d 1578, 1584 (Fed. Cir. 1996).

Jump to MPEP SourceRejections Not Based on Prior ArtRejection of ClaimsAIA vs Pre-AIA Practice
StatutoryInformativeAlways
[mpep-2163-04-e3c70ef158b7c94d5157e733]
Maintain Written Description Rejection If Insufficient Evidence
Note:
If the record still lacks adequate written description, maintain the rejection and fully respond to applicant’s arguments. Analyze any submitted affidavits in the next Office action.

Upon reply by applicant, before repeating any rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, for lack of written description, review the basis for the rejection in view of the record as a whole, including amendments, arguments, and any evidence submitted by applicant. If the whole record now demonstrates that the written description requirement is satisfied, do not repeat the rejection in the next Office action. If the record still does not demonstrate that the written description is adequate to support the claim(s), repeat the rejection under 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, fully respond to applicant’s rebuttal arguments, and properly treat any further showings submitted by applicant in the reply. When a rejection is maintained, any affidavits relevant to the 35 U.S.C. 112(a) or pre-AIA 35 U.S.C. 112, first paragraph, written description requirement, must be thoroughly analyzed and discussed in the next Office action. See In re Alton, 76 F.3d 1168, 1176, 37 USPQ2d 1578, 1584 (Fed. Cir. 1996).

Jump to MPEP SourceRejections Not Based on Prior ArtAssignee as Applicant SignatureApplicant and Assignee Filing Under AIA

Citations

Primary topicCitation
Rejections Not Based on Prior Art35 U.S.C. § 112
Rejections Not Based on Prior Art35 U.S.C. § 112(a)
37 CFR § 2163.04
MPEP § 2163
Rejections Not Based on Prior ArtIn re Alton, 76 F.3d 1168, 1176, 37 USPQ2d 1578, 1584 (Fed. Cir. 1996)
In re Marzocchi, 439 F.2d 220, 224, 169 USPQ 367, 370 (CCPA 1971)
In re Wertheim, 541 F.2d 257, 262, 191 USPQ 90, 96 (CCPA 1976)
See Hyatt v. Dudas, 492 F.3d 1365, 1370, 83 USPQ2d 1373, 1376 (Fed. Cir. 2007)

Source Text from USPTO’s MPEP

This is an exact copy of the MPEP from the USPTO. It is here for your reference to see the section in context.

BlueIron Last Updated: 2025-12-31